Safety helmet



FIG. 1 is a top, front and left side perspective view of a safety helmet according to the present invention;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof; and,

FIG. 5 is a top plan view thereof. 

CLAIM The ornamental design for a safety helmet, as shown and described. 